Major TV networks were notified on Friday that the department was examining whether they violated antitrust laws when they suspended pool coverage of President Trump.

Our journalists Sheera Frenkel and Dylan Freedman break down what A.I. agents are, how they differ from chatbots and why A.I. companies are worried about them now.

A new mode includes a study tool, but it still does a user’s homework. And a children’s safety nonprofit says the chatbot flunked its tests.